Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels
- Authors
- Lee, Kyu-Ho; Suh, Jin-Yoo; Hong, Sung-Min; Huh, Joo-Youl; Jung, Woo-Sang
- Issue Date
- 8월-2015
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Heat-resistant steels; Precipitation; Z-phase; Creep-rupture life; Monkman-Grant equation
- Citation
- MATERIALS CHARACTERIZATION, v.106, pp.266 - 272
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 106
- Start Page
- 266
- End Page
- 272
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92798
- DOI
- 10.1016/j.matchar.2015.06.005
- ISSN
- 1044-5803
- Abstract
- The creep behavior of high-Cr martensitic heat-resistant steels was investigated to discuss the dominant factors determining the creep-rupture life in the temperature range from 839 to 894 K. Variation in the content of Nb, a carbide former, induced a difference in creep-degradation at the long-term creep condition, which was attributed to the formation of a Z-phase at the expense of M2N precipitates. Due to the continuous evolution of the microstructure during creep service, a simple form of the Monkman-Grant equation could not properly describe the creep-rupture life of the alloys; however, the modified Monkman-Grant equation, which incorporates the creep rate at the tertiary creep region, resulted in a reasonable estimation of creep-rupture life. (C) 2015 Elsevier Inc. All rights reserved.
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